Hydraulic press.



W. T. HOGG & L. T. RAND.

HYDRAULIC PRESS.

APPLICATION mm SEPT. 15. I9l4.

1,185,799. Patented June 6,1916.

526 Inventors by 3/71 I 5 WM I I I I Attorneys UNITED STATES PATENT oEEIoE.

WILLIAM THOS. HOGG AND LYNNE THOMAS RAND, OF UNITY, MAINE.

HYDRAULIC PRESS.

Application filed September 15, 1914.

To all whom it may concern.-

Be it known that we, WILLIAM TH0s. Hose and LYNNE T. RAND, citizens of the United States, residing at Unity, in the county of Waldo, State of Maine, have invented a new and useful Hydraulic Press, of which the following is a specification.

The present invention relates to improvements in hydraulic presses, especially designed for straightening shafting, placing on or removing pulleys or driving gears from shafting or in fact working upon anything where heavy or rapid blows would endanger the mechanism.

The object of the present invention is the provision of automatic means which Will automatically release the pressure at the rear of the piston should the same become excessive and tend to cause the piston to drive the head off of the cylinder.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings-Figure 1 is a Vertical longitudinal sectional view through the cylinder of the press showing the means for automatically releasing the pressure. Fig. 2 is an enlarged detail view of the automatic discharge member of the casing. Fig. 3 is a front elevation of the lever supporting yoke and the automatic releasing mechanism. Fig. 4 is a detail view of the valve and the stem.

Referring to the drawings, the numeral 1 designates the cylinder which is provided with the flange 2 at the open end thereof, the cylinder adjacent the flange being adapted to be surrounded by the two mem bers 3 and 4 which constitute a bracing and supporting yoke for the open end of the cylinder.

The open end of the cylinder 1 is sealed by the plate or head 16, the same being attached thereto by means of the bolts 16 which are of such a strength as to permit of the breaking of the bolts under undue strain rather than the fracture of the head 16. This head 16 is provided with the stuffing Patented June 6, 1916. Serial No. 861,862.

box 17, in which is mounted the plunger 18 whose rear end is reduced and threaded as at 19 to engage and attach it to the piston head 20. This piston head 20 is a cylindrical disk composed of metal, and attached to the opposite faces thereof and extending to engage the inner wall of the cylinder 1, are the two flexible gaskets 21 and 22, which are preferably made of leather.

Provided at the rear end and concentrically of the cylinder 1 is the pressure fluid irecting port 23, which has led thereto, the pipe 24: while connected in the disk or head 16 are two pressure fluid directing pipes 25 and 25. By this means, the piston 20 may be properly moved either to push the plunger when driving pulleys or gears upon the shaft or to pull the plunger to assist in removing the same from the shaft In order to provide a means for automatically releasing the pressure at the rear of the piston 20 when the plunger 18 is being moved from left to right as viewed in Fig. 1, and thereby prevent the plunger from blowing the head 16 under great pressure, the relief port 26 is formed in the bottom intermediate of the ends of the cylinder 1, and has attached thereto, the discharge pipe 27. This pipe 27 is intersected by the valve casing 28, in which is mounted for reciprocation, the valve 29 provided with the intermediate port 30. The parts 2728 provide a cruciform member, one portion of which is connected to the cylinder and the other portion of which carries the valve therein. This valve as shown in Fig. l, is a plunger valve and is connected by means of the stem 31 so that the same may be properly reciprocated, an adjusting collar 32 being disposed upon the stem 31 and being acted upon by the spring 33 whose inner end abuts the adjacent end of the valve casing to normally hold the valve 29 in the position, as shown in Fig. 1, with the port 30 out of registration with the discharge pipe 27. The outer end of the stem 31 is connected to one end of the lever 31, which is pivoted intermediate of its ends to the frame 35 attached to the disk abut the inner face of the disk 16 to injure or remove the same.

What is claimed is:

1. A hydraulic press including a cylinder having a head at one end and an inlet port at its other end, a piston in the cylinder having a piston rod Working through said head, a discharge pipe connected to the cylinder between the ends thereof, a valve normally closing said pipe, and means for opening said valve including a stem slidablc through said head and projecting into the path of the piston to be operated thereby.

2. A hydraulic press including a cylinder having a head at one end and an inlet port at its other end, a piston in the cylinder havfive cents each,

ing a piston rod working through said head, a cruciform discharge member having one portion attached to the cylinder between the ends thereof, a valve slidable in the other portion of said member and having an aperture to be brought into alinement with the first mentioned portion, a lever pivotally connected with said head, said valve having a stem pivoted to said lever, and a stem slidable through said head and pivoted to the lever to be operated by the piston.

In testimony that we claim the foregoing as our own, we have hereto aiiixed our signatures.

VILLIAM THOS. HOGG. LYNNE THOMAS RAND.

by addressing the "Commissioner of Patents,

Washington, D. C. 

